1 /*!**************************************************************************** 2 3 @file PVRTFixedPoint.h 4 @copyright Copyright (c) Imagination Technologies Limited. 5 @brief Set of macros and functions to make fixed-point easier to program. 6 7 ******************************************************************************/ 8 9 #ifndef _PVRTFIXEDPOINT_H_ 10 #define _PVRTFIXEDPOINT_H_ 11 12 #include "PVRTGlobal.h" 13 14 #if defined(BUILD_OGLES) 15 #include "PVRTFixedPointAPI.h" 16 #else 17 #define VERTTYPE PVRTfloat32 18 #ifdef PVRT_FIXED_POINT_ENABLE 19 #error Build option not supported: PVRT_FIXED_POINT_ENABLE 20 #endif 21 #endif 22 23 /* Fixed-point macros */ 24 #define PVRTF2X(f) ( (int) ( (f)*(65536) ) ) 25 #define PVRTX2F(x) ((float)(x)/65536.0f) 26 #define PVRTXMUL(a,b) ( (int)( ((PVRTint64)(a)*(b)) / 65536 ) ) 27 #define PVRTXDIV(a,b) ( (int)( (((PVRTint64)(a))<<16)/(b) ) ) 28 #define PVRTABS(a) ((a) <= 0 ? -(a) : (a) ) 29 30 /* Define trig table macros */ 31 #include "PVRTMathTable.h" 32 33 /* Useful values */ 34 #define PVRT_PI_OVER_TWOf (3.1415926535f / 2.0f) 35 #define PVRT_PIf (3.1415926535f) 36 #define PVRT_TWO_PIf (3.1415926535f * 2.0f) 37 #define PVRT_ONEf (1.0f) 38 39 #define PVRT_PI_OVER_TWOx PVRTF2X(PVRT_PI_OVER_TWOf) 40 #define PVRT_PIx PVRTF2X(PVRT_PIf) 41 #define PVRT_TWO_PIx PVRTF2X(PVRT_TWO_PIf) 42 #define PVRT_ONEx PVRTF2X(PVRT_ONEf) 43 44 /* Fixed-point trig function lookups */ 45 #define PVRTXCOS(x) (cos_val[(PVRTXMUL(((PVRTXDIV((x)<0? -(x):(x), PVRT_TWO_PIx)) & 0x0000FFFF), (NUM_ENTRIES-1)))]) 46 #define PVRTXSIN(x) (sin_val[(PVRTXMUL(((PVRTXDIV((x)<0 ? PVRT_PIx-(x):(x), PVRT_TWO_PIx)) & 0x0000FFFF), (NUM_ENTRIES-1)))]) 47 #define PVRTXTAN(x) ( (x)<0 ? -tan_val[(PVRTXMUL(((PVRTXDIV(-(x), PVRT_TWO_PIx)) & 0x0000FFFF), (NUM_ENTRIES-1)))] : tan_val[(PVRTXMUL(((PVRTXDIV(x, PVRT_TWO_PIx)) & 0x0000FFFF), (NUM_ENTRIES-1)))] ) 48 #define PVRTXACOS(x) (acos_val[PVRTXMUL(((((x) + PVRTF2X(1.0f))>>1) & 0x0000FFFF), (NUM_ENTRIES-1))]) 49 50 /* Floating-point trig functions lookups (needed by some tools chains that have problems with real math functions) */ 51 #ifdef USE_TRIGONOMETRIC_LOOKUP_TABLES 52 53 /* If trig tables are forced ON in non-fixed-point builds then convert fixed-point trig tables results to float */ 54 #define PVRTFCOS(x) PVRTX2F(PVRTXCOS(PVRTF2X(x))) 55 #define PVRTFSIN(x) PVRTX2F(PVRTXSIN(PVRTF2X(x))) 56 #define PVRTFTAN(x) PVRTX2F(PVRTXTAN(PVRTF2X(x))) 57 #define PVRTFACOS(x) PVRTX2F(PVRTXACOS(PVRTF2X(x))) 58 59 #else 60 61 /* Trig abstraction macros default to normal math trig functions for full float mode */ 62 #define PVRTFCOS(x) ((float)cos(x)) 63 #define PVRTFSIN(x) ((float)sin(x)) 64 #define PVRTFTAN(x) ((float)tan(x)) 65 #define PVRTFACOS(x) ((float)acos(x)) 66 67 #endif 68 69 70 /* Fixed/float macro abstraction */ 71 #ifdef PVRT_FIXED_POINT_ENABLE 72 73 /* Fixed-point operations, including trig tables */ 74 #define VERTTYPEMUL(a,b) PVRTXMUL(a,b) 75 #define VERTTYPEDIV(a,b) PVRTXDIV(a,b) 76 #define VERTTYPEABS(a) PVRTABS(a) 77 78 #define f2vt(f) PVRTF2X(f) 79 #define vt2f(x) PVRTX2F(x) 80 81 #define PVRT_PI_OVER_TWO PVRT_PI_OVER_TWOx 82 #define PVRT_PI PVRT_PIx 83 #define PVRT_TWO_PI PVRT_TWO_PIx 84 #define PVRT_ONE PVRT_ONEx 85 86 #define PVRTCOS(x) PVRTXCOS(x) 87 #define PVRTSIN(x) PVRTXSIN(x) 88 #define PVRTTAN(x) PVRTXTAN(x) 89 #define PVRTACOS(x) PVRTXACOS(x) 90 91 #else 92 93 /* Floating-point operations */ 94 #define VERTTYPEMUL(a,b) ( (VERTTYPE)((a)*(b)) ) 95 #define VERTTYPEDIV(a,b) ( (VERTTYPE)((a)/(b)) ) 96 #define VERTTYPEABS(a) ( (VERTTYPE)(fabs(a)) ) 97 98 #define f2vt(x) (x) 99 #define vt2f(x) (x) 100 101 #define PVRT_PI_OVER_TWO PVRT_PI_OVER_TWOf 102 #define PVRT_PI PVRT_PIf 103 #define PVRT_TWO_PI PVRT_TWO_PIf 104 #define PVRT_ONE PVRT_ONEf 105 106 /* If trig tables are forced ON in non-fixed-point builds then convert fixed-point trig tables results to float */ 107 #define PVRTCOS(x) PVRTFCOS(x) 108 #define PVRTSIN(x) PVRTFSIN(x) 109 #define PVRTTAN(x) PVRTFTAN(x) 110 #define PVRTACOS(x) PVRTFACOS(x) 111 112 #endif 113 114 115 // Structure Definitions 116 117 /*!*************************************************************************** 118 @struct HeaderStruct_Mesh 119 @brief Defines the format of a header-object as exported by the MAX plugin. 120 *****************************************************************************/ 121 typedef struct { 122 unsigned int nNumVertex; 123 unsigned int nNumFaces; 124 unsigned int nNumStrips; 125 unsigned int nFlags; 126 unsigned int nMaterial; 127 float fCenter[3]; 128 float *pVertex; 129 float *pUV; 130 float *pNormals; 131 float *pPackedVertex; 132 unsigned int *pVertexColor; 133 unsigned int *pVertexMaterial; 134 unsigned short *pFaces; 135 unsigned short *pStrips; 136 unsigned short *pStripLength; 137 struct 138 { 139 unsigned int nType; 140 unsigned int nNumPatches; 141 unsigned int nNumVertices; 142 unsigned int nNumSubdivisions; 143 float *pControlPoints; 144 float *pUVs; 145 } Patch; 146 } HeaderStruct_Mesh; 147 148 149 #ifdef PVRT_FIXED_POINT_ENABLE 150 151 /*!*************************************************************************** 152 @struct HeaderStruct_Fixed_Mesh 153 @brief Defines the format of a header-object as when converted to fixed point. 154 *****************************************************************************/ 155 typedef struct { 156 unsigned int nNumVertex; 157 unsigned int nNumFaces; 158 unsigned int nNumStrips; 159 unsigned int nFlags; 160 unsigned int nMaterial; 161 VERTTYPE fCenter[3]; 162 VERTTYPE *pVertex; 163 VERTTYPE *pUV; 164 VERTTYPE *pNormals; 165 VERTTYPE *pPackedVertex; 166 unsigned int *pVertexColor; 167 unsigned int *pVertexMaterial; 168 unsigned short *pFaces; 169 unsigned short *pStrips; 170 unsigned short *pStripLength; 171 struct 172 { 173 unsigned int nType; // for the moment, these are left as floats 174 unsigned int nNumPatches; 175 unsigned int nNumVertices; 176 unsigned int nNumSubdivisions; 177 float *pControlPoints; 178 float *pUVs; 179 } Patch; 180 } HeaderStruct_Fixed_Mesh; 181 182 typedef HeaderStruct_Fixed_Mesh HeaderStruct_Mesh_Type; 183 #else 184 typedef HeaderStruct_Mesh HeaderStruct_Mesh_Type; 185 #endif 186 187 // Function prototypes 188 189 /*!*************************************************************************** 190 @brief Converts the data exported by MAX to fixed point when used in OpenGL 191 ES common-lite profile. 192 @param[in] headerObj Pointer to object structure in the header file 193 @return directly usable geometry in fixed or float format as appropriate 194 *****************************************************************************/ 195 HeaderStruct_Mesh_Type* PVRTLoadHeaderObject(const void *headerObj); 196 197 /*!*************************************************************************** 198 @brief Releases memory allocated by LoadHeaderObject when geometry no longer 199 needed. 200 @param[in] headerObj Pointer returned by LoadHeaderObject 201 *****************************************************************************/ 202 void PVRTUnloadHeaderObject(HeaderStruct_Mesh_Type* headerObj); 203 204 205 #endif /* _PVRTFIXEDPOINT_H_ */ 206 207 /***************************************************************************** 208 End of file (PVRTFixedPoint.h) 209 *****************************************************************************/ 210 211
